To provide a paper container configured such that when a push-in area and a separation area are separated along a separating line, the break of the target break segments of the separating line can smoothly be progressed from the push-in area to the separation area over the corner of a paper container, and to provide a paper container blank.

The separation aiding lines 11 and 11 of the paper container are series of cuts Ct formed on both widthwise sides of each separable flap 20 symmetrically, and they are formed extremely long compared to other cuts Ct of the separating line 10. To open the paper container, the push-in area 21 is pushed in toward the inside of a container body, thereby each of the target break segments Sh of the separation lifting line 12 of the separating line 10 is broken. When all the target break segments Sh of the separation lifting line 12 are broken, the push-in area 21 is separated from a bottom plate 3 along the separating line 10. Further the break of the separating line 10 develops to the respective final points 11e and 11e of the separation aiding lines 11 and 11 simultaneously.